Valve-reseating machine



I R. LAKES VALVE msssmme mcanm Filed April 2, 1 2

2- if: .WD T T M 6 16 6 9 s A 5 ii 9 I 1 ma A TTOR/VE Y8 Patented Feb. 17, 1925.

1 UNITED STATES ROBERT LAKES, 0F BROOKLYN, NEW YORK.

VALVE-RESEATING MACHINE.

Application filed April 2, 1924. Serial No. 703,727.

To all whom it may concern:

Be it known that I, ROBERT LAKES, a citizen of the United States, and a resident of the oity'of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Valve-Reseating Machine, of which the following is a full, clear, and exact description.

This invention relates to valve reseating machines and more particularly to a device which can be easily and quickly secured in operative position on a valve casing for steam boilers and the like, and which will accurately and uniformly cut or rebore a valve seat, leaving the seat absolutely smooth, without chattering or uneven surface whatever.

A further object is to provide a device of this character which can be finely adjusted to take from the surface of the seat as fine or as heavy a cut as desired with a single revolution of the cutting tool. and at the end of such cutting operation will, by reason of its spring or resilient pressing means, cause the cutter to cease to out after it has completed one turn and require an additional adjustment before a second cutting action is possible. This absolutely prevents cutting too deeply into the seat and even though the operator may continue to turn the tool the action will be simply one of polishing rather than cutting.

A further object is to provide a device of this character which can be quickly and securely positioned on a valve casing, which will be exactly centered with relation to the valve seat, and which can be easily and quickly as well as minutely or finely adjusted to remove just as much at each cutting operation as may be desired, thus resulting in a perfect reboring or grinding action and in a saving of time and expense.

With these and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view, mainly in section but partly in elevation, illustrating my improved machine secured in operative position on the valve casing;

Figure 2 is a top plan view of my improved machine;

convenient means Figure 3 is a perspective view of a shaft extension.

For the purpose of illustrating my invention I have shown an ordinary type of valve casing 1 having a valve seat 2 therein, and provided with ordinary threaded studs 3 for the reception of nuts (not shown) to secure the cover (not shown) on the valve casing. I utilize these studs as a securing or coupling means for my improved machine, as clearly shown in Figure 1.

A: represents a transverse bar constituting the framework of my improved machine, said bar having longitudinal slots 5 therein for the reception of threaded studs 6 on the upper ends of coupling posts 7. These posts 7 have threaded sockets 8 therein receiving the studs 3 whereby they are firmly fixed tothe valve casing, and said posts are preferably hexagonal in form externally to receive a wrench to securely tighten them in position. Nuts 9 are screwed onto the threaded studs 6 above the bar 4, and washers 10 are located at opposite sides of the bar 4 between the nuts 9 and posts 7 to bridge the slots 5 and insure a rigid gripping action between the posts and the bar when the nuts are screwed home.

The bar 4 is provided centrally with an internally screw-threaded housing 11 having an internal flange 12 at its lower end, said flange constituting a bearing for a shaft 13. The shaft 13 has an annular flange 13 thereon within the housing 11, and a tubular plunger 15 is screwed into the upper end of the internally threaded housing 11 and is provided with any suitable head 14 having or conveniently constructed for turning the same either by hand or by power. I have illustrated the head 14: as having the ordinary spanner wrench receiving sockets 14 therein although it is obvious that this plunger may be turned in any desired way.

Between the inner end of the plunger 15 and the flange 13' on shaft 13 I locate a coil spring 1.6. This spring 16 is positioned around the shaft 13 and has washers 17 located at the ends of the spring and bearing against the flange 13 and plunger 15, respectively. The outer end of the shaft 13 is adapted to be manually operated by means of a lever 18, the latter being preferably provided with an angular socket 19 at one end to engage an angular projection 20 on the shaft to couple them together. It is, of course, operated by. any form of lever or other means employed for turning the shaft 13 as may be desired.

The shaft 13 is provided with. aslot21 to receive a cutter 22, the latter preferably secured therein by a Wedge 23.;

it here the valve casing is relatively large,

as shown in the draWing,1I provide a shaft extension 24; having a threaded stud 25 fitting in a socket 26 in the lower end of shaft 13 and likewise provided With a slot 21 to receive theccutter, 22 and Wedge 23. It is obvious that these extensions may be of any desired. length and any desirednumberso as to make the machine readily applicable to any size of valve casing.

On theloiver end of extension 24 I provide a threaded stud 271 on which a centering disk 28-is securedby a nut '29. -This disk 28 is of the proper diameter to fit Within thecylindrical portion of thevalv'e seat 2 to. turn freely therein but to serve'as a guide to positively center the cutter With relation to the seat.

The operation is-as follows:

'lviththepalts asshown in Figure 1,the operator turns the plunger 15 slightly, as much or as little as may be desired to give the necessary pressure to the cutter. This pressure is exerted bythe spring or other resilient means 16 so that the cutter is forced into engagement with the seat to cut as deeply as may-be desired for a single revolution. When the cutter isturned by reason of the lever 18 and shaft 13 it Will'cut or remove from the valve seat 2 a shaving or portion of just the desired thickness and Will cease to cut at'the' end of a complete rev olution of the shaft, as the spring 16 Will not exert any'more'pressure than to which it is adjusted, so that a continued turning movement ofithe shaft Will not function to cut any deeper into the seat.

In common practice the plunger 15 is turned to remove a portion of the seat face, is again adjusted toremove another portion of the seat face, ;and by these fine adjustments the valve seatcan be accurately bored andsmoothly finished Without danger of irregularities, chattering or other defects in the surface. The importance, therefore, of the resilient cutter pressing devicecannot be exaggerated as it is this resilient means which puts the cutter under pressure, pre vents overcutting, and is set to regulation by the fine adjustment of the plunger 15.

Various slight changes and alterations might be made in the general form of the parts described Without departing from my invention, and hence I do not limit myself to the precise details set forth but consider myself at liberty to makesu'chslight changes and alterations as fairly fall Within the spirit and scope of the appended claims.

I claim:

1. A machine of the character described, comprising a support, a housing fined to the support, a shaft having rotary mounting in the housing and havingan annular shoulder thereon in the housing, a tubular plunger fitting the shaft and having screw-threaded engagement with the inner Wall of the housing, a coil spring in the housing between the shoulder and the inner end of theplunger, a guide disk secured to the lower end of the shaft and adapted to center the shaft in a. valve seat, and means for turning the shaft.

2. A machine of the character described, comprising a slotted bar, a pair of posts having threaded sockets therein adapted to receive the studs of a valve casing, threaded studs on the posts projecting through the slots, nuts on the posts, Washers interposed between the nuts, posts and bar whereby the bar is clamped by the movement of the nuts. a central integral internally screw-threaded housing on the bar, a 'shaft projecting through the housing, an annular flange on the shaft Within the housing, an externally screw-threaded tubular plunger on the shaft adjustable on the upper end of the housing, a coil spring betweenthe inner end of the housing and the flange Wherebyprcssure is exerted on the shaft in accordance withthe adjustment of the plunger, and cutting means carried by the shaft for engaginga valve seat.

ROBERT LAKES. 

